<template>
	<view>
		<!-- 使用搜索自定义组件 -->
		<my-search :bgColor="'#c00000'" :radius="15" @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-view-scroll" scroll-y="true" :style="{ height: wh + 'px' }">
				<block v-for="(item, index) in cateList" :key="index">
					<view :class="['left-scroll-view-item', index === active ? 'active' : '']" @click="activeChanged(index)">{{ item.cat_name }}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
				<!-- 二级分类 -->
				<view class="cate-lv2" v-for="(item2, index2) in cateLevel2" :key="index2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{ item2.cat_name }} /</view>
					<!-- 三级分类 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3, index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon" class="cate-lv3-img"></image>
							<text>{{ item3.cat_name }}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
export default {
	data() {
		return {
			wh: '', //高度
			cateList: [], //一级分类数据
			active: 0, //动态激活
			cateLevel2: [], //二级分类数据
			scrollTop: 0 //滚动条距离顶部的距离
		};
	},
	onLoad() {
		//获取屏幕可视高度
		const sysInfo = uni.getSystemInfoSync();
		this.wh = sysInfo.windowHeight - 50; //减去搜索框的高度
		// 获取所有分类数据
		this.getCateList();
	},
	methods: {
		// 获取所有分类数据
		async getCateList() {
			const { data: res } = await uni.$http.get('/api/public/v1/categories');
			//获取数据失败
			if (res.meta.status !== 200) return uni.$showMsg();
			//转存数据
			this.cateList = res.message;
			//为二级分类赋值
			this.cateLevel2 = res.message[0].children;
		},
		//点击一级分类触发事件
		activeChanged(index) {
			//点击一级分类菜单动态的切换左侧边栏的激活状态
			this.active = index;
			//动态给二级分类赋值
			this.cateLevel2 = this.cateList[index].children;
			//让 scrollTop 的值在 0 与 1 之间切换
			this.scrollTop = this.scrollTop ? 0 : 1;
		},
		//点击三级分类item跳转页面
		gotoGoodsList(item) {
			uni.navigateTo({
				url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
			});
		},
		gotoSearch() {
			console.log('在组件外部打印');
			uni.navigateTo({
				url: '/subpkg/search/search'
			});
		}
	}
};
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;

	.left-view-scroll {
		//固定宽高度可以使用px
		width: 120px;

		.left-scroll-view-item {
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			background-color: #f7f7f7;

			&.active {
				background-color: #fff;
				position: relative;

				&::before {
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
					background-color: #c00000;
				}
			}
		}
	}
}
.cate-lv2-title {
	text-align: center;
	font-size: 14px;
	font-weight: bold;
	padding: 15px 0;
}
.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item {
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
	}
	image {
		width: 60px;
		height: 60px;
	}
	text {
		font-size: 12px;
	}
}
</style>
